\chapter{Background}
\label{chapter3}
\thispagestyle{empty}
This chapter introduces concepts and terms that relate to the field of model-driven information retrieval and are used in the rest of the thesis. In Section~\ref{general-ir-architecture} we briefly explain some of the most important ideas taken from the field of Information Retrieval. In Section~\ref{metamodeling} we give an insight of metamodeling concepts, while in Section~\ref{uml} and in Section~\ref{webml} we discuss about the two metamodels we addressed in our experiments.

\section{General IR Architecture}
\label{general-ir-architecture}
\input{general_ir_architecture}

\section{Modeling and Model Driven Development}
\label{metamodeling}
\input{metamodeling}

\section{UML}
\label{uml}
\input{UML}

\section{WebML}
\label{webml}
\input{webml}
